Core blowing machine



Dec. 6, 1949 A. N. TACCONE 7 2,490,559

CORE BLOWING MACHINE Filed July e, 1946 s Sheets-Sheet 1 Dec, 6, 1949 TACCYONEI 2,490,559

CORE BLOWING MACHINE Filed July 6, 1946 3 Sheets-Sheet 2 IN V EN TOR.

Awa /yawn Dec. 6, 1949 A. N. TACCONE cons BLOWING MACHINE 3 Sheets-Sheet 3 Filed July 6, 1946 INVENTOR. "7 A/. 7Zcwe Patented Dec. 6, 1949 CORE BLOWING MACHINE Anthony N. Taccone, North East, Pa., assignor to Taccone Pneumatic Foundry Equipment Corporation, North East, Pa" a. corporation of Pennsylvania Application July 6, 1946, Serial No. 681,641

16 Claims.

This invention relates generally to core making machines, and more particularly to machines which blow sand into core molds.

Devices of this type, made according to the teachings of the prior art, and with which I am familiar, provide a jet of air through the center of a sand holder, leaving a large portion of the sand in the sand holder clinging to the walls thereof, because of the viscous nature of the sand for making cores. The bottom of the sand holders have a sieve-like structure and great difficulty has been experienced in blowing the sand from the sand holder. Inverted v shaped sand holders have been tried, but the sand still clings tothe side of the holder. None of these prior machines have provided automatic shut-ofi means for the air. No means has been provided on the prior machines for fully engaging the sand holder automatically with the resultthat sand was blown in the face of they operator and the machine and the sand holder are forced out of alignment.

It is, accordingly, an object of my invention to overcome the above and other defects in machines for blowing said into a mold, and it is more particularly an object of my invention to provide a machine for blowing sand into a mold which is simple in construction, automatic in operation, easy to operate, and economical in cost. 4

Another object of my invention is to provide a machine for blowing sand into a mold which disperses the air throughout the entire area of the sand holder.

Another object of my invention is to provide an automatic means for shutting 011 the air supply in a machine for blowing sand into a mold.

Another object of my invention is to provide machine for blowing sand into a mold which requires minimum of air pressure for operation.

Another object of my invention is to provide means for increasing the pressure of the air in machine for blowing sand into a mold.

Another object of my invention is to provide automatic universal seating means between a sand blowing machine and a sand holder.

Another object of my invention is to provide a novel means for disposing a sand holder in alignment with a sand blowing machine.

Other objects of my invention will become evident from the following detailed description, taken in conjunction with the accompanying drawings, in which Fig. l is a vertical sectional view through the operating cylinder of my novel machine for blowing sand into molds.

Fig. 2 is a plan view of my novel machine. Fig. 3 is a front elevational view of my novel 7 machine, and

Fig. 4 is a vertical sectional view of an alternative form of my novel machine.

Referring now to the drawings, Figs. 1, 2, and 3 show a base I with a vertically disposed hollow cylindrical member 2 extending upwardly on the back side thereof. A bracket 4 with oppositely disposed semi-cylindrical portions 5 and 5, engaged by outer semi-cylindrical clamp members and 8 through bolt and nut assemblies 9 and H1, engage the cylindrical member 2 and an invertedcylindrical member Zil, respectively. The hollow cylindrical member 2 has an inlet I4 andputlets l5 and Hi, and forms a reservoir .for air. A cylindrical piston 2|, has a depending flanged'portion 22 on the upper end thereof for engagement with the inner side of the cylindrical member 20. An annular L-shaped washer 23 is disposed on the upper end of the piston 2| and is held in position by a cap member 24 having an upwardly extending marginal portion 25 for engaging an inner abutting portion 26 formed in the domed head 21 of the cylindrical member 20. Screw bolts 28 secure the cap member 24 to the piston 2|. Cap member 24 has a central opening over which is disposed and secured the flanged end 29-of a slidable bushing 30 by means of screw bolts 3| secured to cap member 24. A gland member 32 in a recessed portion I05 of the domed head 21 seals the bushing 30. The lower end of the piston 2| is telescopically disposed in a sleeve 40, which is secured against rotation by a keyway 4| in one side thereof and a key member 42 en.- gaglng complementary flanged collars 43 secured to an outwardly extending projecting portion 44 of the cylindrical member 20 by screw bolts 45. An L-shaped sleeve 46 is disposed in the lower portion of the cylindrical member 20 to receive a coil spring 41 which is nested at its upper end in the outwardly extending depending flanged portion 22 of the piston 2|. An annular L-shaped asket 48 is disposed in the bottom portion of the piston 2|, and engages the inner surface of the cylindrical sleeve and is secured by flanged spring retaining member 49 and screw bolts 58. The piston 2| has a depending portion 52 on the lower end thereof for engagement with the inner side of the spring retaining mem ber 49. Apertures 5| in the wall 5. of the piston 2| permit the passage of air from the piston 2| to the sleeve 40. A centrally disposed aperture 53 in wall 55 of the piston 2| has disposed therein a longitudinally extending shaft 56 with a reduced threaded portion 51 on the upper end thereof and an enlarged portion 56a on the lower end thereof forming an intermediate shoulder. The upper reduced portion of the shaft 56 slides in the aperture 53 in wall 55. A spring 59 engaging the wall 55 and surrounding the shaft 56 is held in position by engagement with a washer 58 held by a nut 54 engaging the threaded portion 51 of the shaft 56. The lower end of the shaft 56 has a tapered portion 60 for re-' ceiving a tapered aperture 6| in a valve head 62 which is secured to the bottom of the shaft 56 by nut 63. The periphery of the valve head 62 is tapered to engage a tapered seat 64 in seating member 65. The seating member 65 is held in position by a threaded annular collar 61 threadedly engaged to the threaded portion 68 on the lower end of the sleeve 40 and an annular ring 10 secured to the bottom of the collar 61 by screw bolts H. A gasket 12 is disposed on the upper cut-away portion 13 of the seating member 65 and is held in position by an annular ring 14 secured to the seating member 65 by screw bolts 15. A coil spring 16 is disposed in the sleeve 40 between the ring 14 and the flanged spring retaining member 49. Vertically extending coil springs 80 are disposed in annular grooves 8I and 82 formed in the seating member 65 and the collar 61, respectively, to permit universal movement of the seating member 65 upon engagement with a sand holder 83. An annular member 84, of a suitable composition, is disposed on the bottom of the seating member 65 to prevent scarring of the top of the sand holder 83. The collar 6'! has an outwardly extending arm 86 with a vertically extending tapered aperture 81 for receiving tapered shaft 88, which mounts an arm 86 having a cylindrical portion 90, on the lower end thereof, secured by washer 9! and a nut 92. The sand carrier 83 is disposed in the cylindrical portion 90 of the pivoted arm 89 and screw bolts 93 are provided to secure the sand carrier 83. A sand hopper I is disposed laterally of the cylindrical member 20 and has an aperture MI in the bottom thereof, normally closed by a pivoted cylindrical cover member I02, urged to a closed position by spring I03. The bottom of the hopper I00 is substantially in a horizontal plane with the bottom of the seating member 65 so that the sand carrier 83 may be pivoted on the arm 89 to a position underneath the hopper I00 by merely swinging it around to the dotted position shown in Fig. 3. The sand holder 83 forces the cover member I02 against the force of the spring I03, away from the aperture l0l, so that the sand carrier 83 is directly beneath the aperture IOI, whereby sand flows in the sand holder 83. When the sand holder 83 is pulled away from the bottom of the hopper I00, the spring I03 pulls the cover member I02 to a position covering th aperture IOI in the bottom of the hopper I00.

The hollow column member 2 with inlet I4 and outlets I and I6 for air provides air to the bushing 30 through outlet I6 and hose H0 connected to the upper end of the bushing 30 and ou let I5- There are no valves in this line, and it is an open line from the reservoir 2 to the piston 2I. The domed head 2'! of the cylindrical member 20 and the cap 24 forms a chamber III in the upper end of the cylindrical member 20.

. 4 and an aperture H2 extends into this chamber where air is introduced from outlet I5 through hose H3, fitting H4, hose H5, pet cock H6 and pipe line H8. The pet cock H6 controls the amount of air passing into the chamber III. The fitting H4 has an exhaust port I", which is automatically connected to the hose H5 and chamber III when a solenoid in the fitting H4 (not shown) is deenergized. When the solenoid is energized by a suitable switch (not shown) the exhaust port HT is closed and the air is free to flow from reservoir 2 through outlet I5, hose H3, fittin H4, hose H5, pet cock H6, pipe line I8, to the chamber III. The sand holder 83 fits over and engages a mold box I20, as shown in Fig. 3, wherein the sand may be blown from the sand holder 83 to the mold I20.

In operation, the sand holder 83 is swung beneath the hopper I00 and filled with sand and then swung back to the position underneath the seating member 65, as shown in Figs. 1 and 3. Solenoid member (not shown) in fitting H4 is then energized, whereupon air passes from the reservoir 2 through outlet I5, hose H3, fitting H4, hose H5, pet cock H6, pipe H8, into chamber Hi, thereby causing downward movement of the piston 2i against the force of coil springs 41 and T6. The force of the air in chamber III against the cap member 24 causes the piston 2I to move downwardly. The downward movement of the piston 2I exerts a downward force on the spring 16 which moves the sleeve 40 downwardly inasmuch as it exerts a downward pressure on the seating member 65 retained by ring 10 in annular collar 61 secured to sleeve 40. The downward movement of the piston 2| also compresses the spring 41. The piston 2I and sleeve 40 move downwardly until the seating member 65 engages the top of the sand holder 83 and it is in seating engagement with the top thereof. The continued downward movement of the piston 2| forces the shaft 56 and the valve head 62 thereon downwardly, wherein the valve head 62 passes into the interior of the sand holder 83 a predetermined distance. Since the air continuously enters the piston 2I through bushing 30, hose H0, and outlet I6, and passes down into the sleeve 40, it will be evident that this air, at a suitable pressure, passes to the sand holder 83 and is dispersed outwardly over the tapered seating portions of the valve head 62. The solenoid fitting H4 is then deenergized and exhaust port H1 opens, causing the coil springs 41 and 16 to return the piston 2| to its normal position as shown in Fig. 1, almost instantaneously. The shaft 56 also moves upwardly with the piston 2!, and the valve head 62 seats on the seating surface 64 of the seating member 65. The operation of filling the sand holder 83 is again repeated, and the same operation followed as heretofore described.

The alternativ construction shown in Fig. 4 of the drawings is substantially the same as that described in Fig. 1 except that a check valve is disposed in the top of the piston, the bottom of the piston is somewhat modified and the vertically extending shaft is modified. Referring now to Fig. 4, inverted cylinder member 200 has a dome shaped head 20I with a centrally disposed recess 202 for receiving a bushing 203 sealed by gland member 204. A piston 205, with a depending flanged portion 206 is disposed in the cylinder 200 and has a washer 201 and a cap member 208 secured to the top thereof by screw bolts 209. The cap member 208 has a central amino aperture 2210 with an apertured web tit tor receiving the stem 212 of a valve 2H. which seats on seat. 2 M. in the flanged'endi E5 of thebushlng 263, the flanged end. He being secured. tothe cap 20185 by screw bolts 2H; A spring 3.001sdisposed between Webb 2!! and the 21-3 to urge the valve H3 in seating relationship with the: seat 2i'4... The bottom end or the piston. 205, is disposed telescopically in a sleeve 220: which has a. key way 221 in the side thereof for receiving:- a key 222 in engagement with a keyed member 223 of a collar 224. secured to outwardly extending portions 225 on the bottom of the cylindrical member 200 by screw bolts 225. The top-of sleeve 22H has av flanged portion 221 tolimit the vertical downward movement of the sleeve 22!. The bottom portion 228 of the piston 205 has apertures 230 disposed therein andalso has a centrally disposed aperture 231 for receiving a vertically extending shaft 232. A spring- 296 is disposed between the bottom portion 228- of the piston rod 205 and the washer 23 and nut 233 on the upper end of the shaft 232; The shaft 232 has a shoulder 235 formed thereon for-seat ing the internally flanged portion 235 of flanged spring retaining member 231. An outwardly projecting seating portion 238' is provided on top of the spring retaining member 231 to engage a seat 243 formed in the bottom portion 228' of the piston 205.

An annular L-shaped member 241' is provided in the cylinder member 200 to nest one end of: coil spring 242 which is nested at the top end in the depending flanged portion 206 of the plston 205.

The flanged spring retaining member 23? is. secured to the shaft 232 by washer 243 and screw nut 2:34. The bottom end of the shaft 232' has. a cylindrical recess 245 and another continuing reduced recess 24! for receiving the stem 248 of piston 249 secured to a lower shaft 250 by screw thread portion 25!. The shaft 250 has an enlarged head 252 for receiving the end 253 of the shaft 232. A look screw 254' is provided in the head 252 to lock the shaft 250. against rotative movement relative to the shaft. 232. The bottom end of the shaft 250 has a tapered portion 255 for receiving the tapered aperture 256 of a valve head 251, which has a beveled peripheral seating portion 258 for engaging beveled seat 25am seating member 260. The seating member 261') is secured between a collar 26f and a locking member 235 with springs 262 therebetween the same as described for Fig. 1. A was-her 263 is secured to the top of the seating member 250 by ring- 264 and. screw bolts 255. A spring 266. is disposed in the sleeve 220 between the spring retaining member 23? and the ring 264. The source of air through bushing 203v and through aperture 210 in the domed head of the cylinder 200 is the same as that described in Fig. 1. The construction of the sand holder 2' on the pivoted arm 22;! is identical with the sand holder described in Fig. 1.

In operation, air is provided through aperture 21s to the chamber in the domed head 20I to force the piston 205 downwardly. Upon downward movement of the piston 205, no air enters the piston 225 through the bushing 203 because of the check valve 2I3, thus compressing the air in the piston 225 and the sleeve 220. When the seat 246 on the bottom of the piston 205 engages the seating portion 238 on the spring retaining member 231, the shaft 232 moves downwardly carrying with it the valve head which passes 6 into the sand holder 21 l-. The. air which has been compressed and whose pressure has been greatly increased in the piston 205 and sleeve 22!! is dispersed in the sand holder by the valve head; 251.. The air is then exhausted through aperture 2l0-from; the upper portion of the cylinder membar 200; by means as described in Fig. 1 and springs: 242 and 266 cause the piston 265 to return to its. normal position as shown in Fig. 4. In the upward movement of the piston 205, the check: valve 2l3 opens because of the greater air pressure in the bushing 203 to fill the piston 205 and sleeve 22.2 with air through the bushing 203. The check valve '2 i3 is normally open in that the spring 300 urging the valve 2E3 against the seat 2% is designed to permit the valve M3. to. open under normal conditions.

Thefianged portion. 22.7: on. the sleeve 228 limits the downward movement of the sleeve 220'. The downward movement of the valve head 251' is limited by adjustment of the screw portion 25! of the piston 2 29 in the recessed portion 24% of the shaft 232:. Initially, the seating member 260 seats on the sand holder 2'' as described in Fig;

The purpose of providing my modified construction is: to permit the use of reduced pres.- sures in the operation of my novel core blowing machine. Itv has: been found that my novel machine will, operate on less than one-half of the pressure. required for the operation of present sand blowing machines.

It, will. be evident from the foregoing that I have provided a novel machine for blowing sand from sand holder-s which has universal auto- Ina-tic seating means, which disperses the air passing into the mold around the periphery of the sand holder to completely free the sand holder from sand, and which automatically in creases. the pressure of the air passing to the sand holder as part of the operation of my machine.

Various changes may be made in the specific embodiment of my invention without departing from the spirit thereof or from the scope of the appended claims.

What! claim is:

1. A machine of the type described, in combinatlon, a cylinder, a sleeve telescopically disposed in said cylinder, a hollow piston engaging said cylinder and said sleeve, passage means connecting the interior of said piston with the interior of said sleeve, a seating member on the bottom of said sleeve, a valve in said seating member, a shaft movable with said piston having said valve attached thereto, a source of air connected to the interior of said piston, and means for moving said piston and sleeve longitudinally in said cylinder.

2. A machine as set forth in claim 1 wherein the seatingmember on the bottom of said s eeve is yleldable.

3. A machine of the type described, in combination, a cylinder, a. movable sleeve telescopically disposed in said cylinder, a hollow piston engaging said cylinder and sleeve, passage means connecting the interior of said piston with the interior of said sleeve, a shaft movable with said piston, a valve head attached to said shaft, a seating member on the bottom of said sleeve having a seat for seating said valve, a source of air connected to the interior of said piston, and means for longitudinally moving said piston in said cylinder and for returning the piston in an opposite direction.

4. A machine as set forth in claim 3 wherein said means for moving said piston in said cylinder is a source of air and means for returning said piston in an opposite direction is a spring memher.

5. A machine for blowing sand into a mold comprising a cylinder, a sleeve telescopically disposed in said cylinder, a piston engaging said cylinder and said sleeve, a shaft movable with said piston, a valve attached to said shaft, a seating member on the end of said sleeve having a seat for seating said valve, a check valve in said piston, a source of air for moving said piston in said cylinder and said shaft, and means for returning s d piston and shaft in an opposite direction.

6. A mach e as set forth in claim wherein said shaft ha a means disposed intermediate thereof to engage the bottom of said piston when it moves a predetermined distance to unseat said valve.

7. A machine of the type described comprising an inverted open cylinder, a sleeve telescopically disposed in said cylinder, a hollow piston movable in said sleeve and engaging said cylinder, passage means connecting the interior of said piston with the interior of said sleeve, a shaft movable with said piston, a valve connected to said shaft, a movable seating member on the bottom of said sleeve having a seat for seating said valve, a source of air connected to the interior of said piston, spring means for urging said piston and sleeve in one direction, and means for moving said piston and sleeve in a direction opposite to said springs to unseat said valve.

8. A machine as set forth in claim 7 wherein said means for moving said cylinder against said spring means is a source of air and further means are provided to exhaust said air from said cylinder. 1

9. A machine as set forth in claim 7 wherein means are provided for limiting the movement of said valve.

10. A machine for blowing sand into a mold comprising a hollow cylinder providing a reservoir for fluid, a bracket movable on said cylinder, an inverted open cylindrical member disposed in said bracket, a sleeve telescopically disposed in said open cylindrical member, a piston engaging said open cylinder and movable in said sleeve, a fluid line from said hollow cylinder to said piston, a second fluid line from said hollow cylindrical member to a portion of said open cylinder above said piston, a shaft movable with said piston, a seating member on the bottom of said sleeve having a seat, a valve head carried by said shaft adapted to engage the seat of said seating member, and spring means for urging said piston and sleeve in one direction.

11. A machine as set forth in claim 10 wherein said second fluid line has a valve therein which passes air to the top of said open cylindrical member in one position thereof and exhausts air from the top of said open cylindrical member in another position thereof.

12. A machine as set forth in claim 10 wherein said piston has a check valve and said shaft has a means disposed intermediate thereof adapted to be engaged by the bottom of said piston upon a predetermined movement of said piston to move said valve longitudinally.

13. A machine for blowing sand into a mold comprising a cylinder, a hollow piston movable in said cylinder, a movable seating member having a valve seat, a valve rod movable with said piston, a valve on said rod adapted to engage the seat of said seating member, a source of air connected to the interior of said piston, passage means connecting the interior of said piston with said seating member, and means for moving said piston and attached valve a predetermined distance to unseat said valve whereby the air in said piston is released from said seating member.

14. A machine as set forth in claim 13 wherein means are provided for adjusting the length of said valve rod.

15. A machine as set forth in claim 13 wherein said seating member is mounted on annularly disposed spring members.

16. A machine for blowing sand from a sand holder into a mold comprising a cylindrical member, a hollow apertured piston movable in said cylindrical member, means for moving said piston, a source of air connected to the interior of said piston, an apertured seating member movable with said cylindrical member, passage means between said piston and said seating member, a valve for controlling the flow of fluid from said apertured piston through said apertured seating member, means for automatically opening said valve upon a predetermined relative movement between said piston and said cylindrical member whereby the air in said piston is passed through said apertured seating member, and means for moving said piston upwardly and returning said valve to a closed position.

.- ANTHONY N. TACCONE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS FOREIGN PATENTS Country Date Germany Feb. 15, 1932 Great Britain Feb. 28, 1944 Number Number 

